JP2006307765A - Lift variable valve mechanism of internal combustion engine - Google Patents

Lift variable valve mechanism of internal combustion engine Download PDF

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Publication number
JP2006307765A
JP2006307765A JP2005132599A JP2005132599A JP2006307765A JP 2006307765 A JP2006307765 A JP 2006307765A JP 2005132599 A JP2005132599 A JP 2005132599A JP 2005132599 A JP2005132599 A JP 2005132599A JP 2006307765 A JP2006307765 A JP 2006307765A
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Japan
Prior art keywords
cam
sub
support shaft
movable support
valve
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JP2005132599A
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Japanese (ja)
Inventor
Masahiko Tashiro
雅彦 田代
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP2005132599A priority Critical patent/JP2006307765A/en
Priority to US11/405,678 priority patent/US7252058B2/en
Priority to DE102006019062A priority patent/DE102006019062A1/en
Publication of JP2006307765A publication Critical patent/JP2006307765A/en
Priority to US11/822,917 priority patent/US7387096B2/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/08—Shape of cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
    • F01L13/0026—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio by means of an eccentric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
    • F01L2013/0068—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y10T74/2107—Follower

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To supply oil to a contact part of a subcam and a cam follower to lubricate with simple structure in a lift variable valve mechanism of an internal combustion engine, which is provided with the subcam swingably supported by a movable spindle displaceable in a plane perpendicular to a rotation axis of a valve mechanism cam, driven and swung by the valve mechamism cam, and a cam follower interlocked and connected to an engine valve and driven by the subcam so as to change the lift amount of the engine valve by displacing the movable spindle. <P>SOLUTION: A contact surface 45 comprising in a row a lift 45a to revolve the cam follower 18 and a base circle 45b, whose distance from the spindle of the movable spindle is an equidistance to hold the cam follower 18 at standstill, is formed in the subcam 17 having an oil reservoir 46 opened upward at the upper surface to reserve oil. A lubricating oil hole 47 is formed to lead the oil of the oil reservoir 46 into the base circle 45b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、動弁カムの回転軸線に直交する平面内で変位可能な可動支軸で揺動可能に支承されるとともに前記動弁カムに従動して揺動するサブカムと、機関弁に連動、連結されるとともに前記サブカムに従動するカムフォロワとを備え、前記可動支軸を変位させることで機関弁のリフト量を変化させるようにした内燃機関のリフト可変動弁装置の改良に関する。   The present invention is movably supported by a movable support shaft that is displaceable in a plane perpendicular to the rotational axis of the valve cam, and is linked to an engine valve, and a sub cam that swings in accordance with the valve cam. The present invention relates to an improvement in a variable lift valve operating system for an internal combustion engine that includes a cam follower that is connected and that is driven by the sub cam, and that changes the lift amount of the engine valve by displacing the movable support shaft.

機関弁に連動、連結されるカムフォロワを、動弁カムによって揺動駆動されるロッカーレバー（サブカム）で揺動させるようにし、ロッカーレバーの支点を変位させることで機関弁にリフト量を変化させるようにした内燃機関のリフト可変動弁装置が、たとえば特許文献１により既に知られている。
特開平７−６３０２３号公報 The cam follower linked to and coupled to the engine valve is swung by a rocker lever (sub cam) driven to swing by the valve cam, and the lift amount of the engine valve is changed by displacing the fulcrum of the rocker lever. A lift variable valve operating apparatus for an internal combustion engine is already known from Patent Document 1, for example.
JP-A-7-63023

ところで、このようなリフト可変動弁装置では、ロッカレバーおよびカムフォロワの接触部にオイルを供給して潤滑することが必要であり、しかも潤滑構造も構成が単純であることが望まれるが、上記特許文献１で開示されたものには、そのような潤滑構造は開示されていない。   By the way, in such a lift variable valve operating apparatus, it is necessary to supply and lubricate the contact portions of the rocker lever and the cam follower, and it is desirable that the lubrication structure be simple in structure. Nothing disclosed in 1 discloses such a lubrication structure.

本発明は、かかる事情に鑑みてなされたものであり、サブカムおよびカムフォロワの接触部に、簡単な構造でオイルを供給して潤滑が行えるようにした内燃機関のリフト可変動弁装置を提供することを目的とする。   The present invention has been made in view of such circumstances, and provides a variable lift valve operating system for an internal combustion engine in which oil can be supplied and lubricated to a contact portion of a sub cam and a cam follower with a simple structure. With the goal.

上記目的を達成するために、請求項１記載の発明は、動弁カムの回転軸線に直交する平面内で変位可能な可動支軸で揺動可能に支承されるとともに前記動弁カムに従動して揺動するサブカムと、機関弁に連動、連結されるとともに前記サブカムに従動するカムフォロワとを備え、前記可動支軸を変位させることで機関弁のリフト量を変化させるようにした内燃機関のリフト可変動弁装置において、前記可動支軸に連結されるとともに前記動弁カムの回転軸線と平行な軸線まわりに回動可能なコントロールアームと、該コントロールアームを回動駆動する駆動手段とを含み、オイルを貯留するようにして上方に開放したオイル溜まりが上面に設けられる前記サブカムに、前記カムフォロワを回動駆動するリフト部ならびに前記カムフォロワを静止状態に保持すべく前記可動支軸の軸線からの距離を等距離としたベース円部とが連なって成る当接面が該当接面を前記カムフォロワに当接させるようにして設けられるとともに、前記オイル溜まりのオイルを前記ベース円部に導く潤滑油孔が設けられることを特徴とする。   In order to achieve the above object, the invention described in claim 1 is supported by a movable support shaft that is displaceable within a plane perpendicular to the rotational axis of the valve cam, and is driven by the valve cam. The internal combustion engine lift includes a sub-cam that swings and a cam follower that is linked and connected to the engine valve and that is driven by the sub-cam. The lift of the engine valve is changed by displacing the movable support shaft. In the variable valve operating apparatus, the control valve includes a control arm connected to the movable support shaft and rotatable about an axis parallel to the rotation axis of the valve operating cam, and a drive means for driving the control arm to rotate. A lift part for rotating the cam follower and the cam follower are statically mounted on the sub cam provided on the upper surface with an oil sump opened upward so as to store oil. An abutment surface formed by connecting a base circle portion having an equal distance from the axis of the movable support shaft so as to keep the state in contact with the cam follower; Lubricating oil holes for guiding the accumulated oil to the base circle are provided.

また請求項２記載の発明は、請求項１記載の発明の構成に加えて、前記サブカムを揺動可能に支承する前記可動支軸が、前記コントロールアームに着脱可能に取付けられることを特徴とする。   According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the movable support shaft that rotatably supports the sub cam is detachably attached to the control arm. .

さらに請求項３記載の発明は、請求項２記載の発明の構成に加えて、複数の前記サブカムを揺動可能に支承する前記可動支軸の外周に、可動支軸とは別体であるスペーサが、前記各サブカム間に介在するようにして嵌装されることを特徴とする。   Furthermore, in addition to the structure of the invention described in claim 2, the invention described in claim 3 is a spacer that is separated from the movable support shaft on the outer periphery of the movable support shaft that supports the plurality of sub cams so as to be swingable. Is inserted between the sub-cams.

請求項１記載の発明によれば、カムフォロワに当接すべくサブカムに設けられた当接面に、サブカムの上面のオイル溜まりから潤滑油孔を介してオイルを供給するようにした簡単な潤滑構造で、サブカムおよびカムフォロワの接触部の潤滑を行うことができる。しかも潤滑油孔は、前記当接面のうち大きな荷重がかかることのないベース円部に開口するものであるので、潤滑油孔が設けられることによるサブカムの剛性低下を心配する必要はない。   According to the first aspect of the present invention, a simple lubricating structure in which oil is supplied to the contact surface provided on the sub cam from the oil reservoir on the upper surface of the sub cam through the lubricating oil hole so as to contact the cam follower. Thus, the contact portion of the sub cam and the cam follower can be lubricated. Moreover, since the lubricating oil hole opens in the base circle portion where a large load is not applied on the contact surface, there is no need to worry about a decrease in the rigidity of the sub cam due to the provision of the lubricating oil hole.

また請求項２記載の発明によれば、他の構成要素を取り外すことなくサブカムの着脱操作を行うことができ、部品の交換作業が容易となる。また可動支軸がコントロールアームに対して着脱可能とされることにより、可動支軸の内部に潤滑油通路を形成することが困難となるが、サブカムに設けられるオイル溜まりから潤滑油孔を介してサブカムおよびカムフォロワの接触部の潤滑を容易に行うことができる。   According to the second aspect of the invention, the sub cam can be attached and detached without removing other components, and the parts can be easily replaced. In addition, since the movable support shaft can be attached to and detached from the control arm, it becomes difficult to form a lubricating oil passage inside the movable support shaft, but the oil reservoir provided in the sub cam passes through the lubricating oil hole. Lubrication of the contact portion of the sub cam and the cam follower can be easily performed.

さらに請求項３記載の発明によれば、可動支軸で複数のサブカムを揺動支持する場合でも、可動支軸とは別体であるスペーサをサブカム間に介装するので、可動支軸の形状を単純化しつつ可動支軸の軸線に沿う方向での各サブカムの位置を規制することができる。   Furthermore, according to the third aspect of the invention, even when a plurality of sub cams are oscillated and supported by the movable support shaft, a spacer that is a separate body from the movable support shaft is interposed between the sub cams. The position of each sub cam in the direction along the axis of the movable support shaft can be regulated while simplifying the above.

以下、本発明の実施の形態を、添付の図面に示した本発明の実施例に基づいて説明する。   DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

図１〜図６は本発明の第１実施例を示すものであり、図１は内燃機関の要部縦断側面図、図２は図１の２−２線断面図、図３は高リフト状態での図２の３−３線断面図、図４は動弁装置の要部斜視図、図５は動弁装置の要部分解斜視図、図６は低リフト状態での図３に対応した断面図である。   1 to 6 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional side view of an essential part of an internal combustion engine, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 2 is a cross-sectional view taken along line 3-3 in FIG. 2, FIG. 4 is a perspective view of essential parts of the valve operating device, FIG. 5 is an exploded perspective view of essential parts of the valve operating device, and FIG. 6 corresponds to FIG. It is sectional drawing.

先ず図１〜図５において、内燃機関のシリンダヘッド１１には、１気筒に対して一対の機関弁である吸気弁１２…が開閉作動可能に配設されており、両吸気弁１２…を開閉駆動する動弁装置１３Ａは、両吸気弁１２…に個別に対応した動弁カム１４…が設けられるカムシャフト１５と、前記動弁カム１４…の回転軸線すなわちカムシャフト１５の軸線に直交する平面内で変位可能な可動支軸１６で揺動可能に支承されるとともに各動弁カム１４…に従動して揺動する一対のサブカム１７，１７と、各吸気弁１２…にそれぞれ個別に連動、連結されるとともに前記両サブカム１７…にそれぞれ従動する一対のカムフォロワ１８，１８と、可動支軸１６に連結されるとともに前記カムシャフト１５の軸線と平行な軸線まわりに回動可能なコントロールアーム１９と、該コントロールアーム１９を回動駆動する駆動手段２０とを備えるものであり、可動支軸１６を変位させることで吸気弁１２…のリフト量を変化させることができる。   First, in FIG. 1 to FIG. 5, a cylinder head 11 of an internal combustion engine is provided with a pair of engine valves 12... That can be opened and closed for one cylinder. The valve operating device 13A to be driven includes a camshaft 15 provided with valve operating cams 14 individually corresponding to the intake valves 12, and a plane perpendicular to the rotational axis of the valve operating cams 14, that is, the axis of the camshaft 15. A pair of sub-cams 17, 17 that are supported by a movable support shaft 16 that can be displaced within the shaft and that swing by being driven by each valve cam 14, and each intake valve 12. A pair of cam followers 18, 18 that are connected and driven by the sub-cams 17, respectively, and a control that is connected to the movable support shaft 16 and is rotatable about an axis parallel to the axis of the camshaft 15. And Ruamu 19, the control arm 19 is intended and a driving unit 20 for driving rotation, it is possible to change the intake valves 12 ... lift amount by displacing the movable support shaft 16.

前記両吸気弁１２…のステム１２ａ…はシリンダヘッド１１に配設されたガイド筒２１…に摺動自在に嵌合されており、ステム１２ａ…の上端に設けられるリテーナ２２…と、シリンダヘッド１１に当接されるリテーナ２３…との間に介設される弁ばね２４…により、吸気弁１２…は閉弁方向に付勢される。   The stems 12a of the intake valves 12 are slidably fitted to guide cylinders 21 arranged on the cylinder head 11, and retainers 22 provided on the upper ends of the stems 12a ... The intake valves 12 are urged in the valve closing direction by the valve springs 24 interposed between the retainers 23 that are in contact with the intake valves 23.

シリンダヘッド１１には、一対の吸気弁１２…の両側に配置されるようにしてカムホルダ２５，２５が設けられており、それらのカムホルダ２５…と協働して前記カムシャフト１５を回転自在に支承するキャップ２６，２６がカムホルダ２５…の上面に締結される。   The cylinder head 11 is provided with cam holders 25 and 25 arranged on both sides of the pair of intake valves 12. The camshaft 15 is rotatably supported in cooperation with the cam holders 25. Caps 26 and 26 are fastened to the upper surface of the cam holder 25.

両カムフォロワ１８，１８の一端部は、油圧タペット２７…を介してシリンダヘッド１１に揺動可能に支承されるものであり、シリンダヘッド１１には油圧タペット２７…に通じる油路２８が設けられる。また両カムフォロワ１８…の他端部は前記吸気弁１２…のステム１２ａ…の上端に当接される。さらに両カムフォロワ１８…の中間部にはニードルベアリング３０…を介して第１ローラ３１…が軸支されており、これらの第１ローラ３１…が各カムフォロワ１８…に個別に対応したサブカム１７…にそれぞれ転がり接触する。   One end of each of the cam followers 18 and 18 is swingably supported by the cylinder head 11 via hydraulic tappets 27... And an oil passage 28 communicating with the hydraulic tappets 27 is provided in the cylinder head 11. The other end portions of the cam followers 18 are in contact with the upper ends of the stems 12a of the intake valves 12. Further, first rollers 31 are pivotally supported at intermediate portions of the two cam followers 18 through needle bearings 30. The first rollers 31 are respectively connected to sub cams 17 corresponding to the cam followers 18. Each is in rolling contact.

コントロールアーム１９は、前記両吸気弁１２…の両側に配置されるウエブ１９ａ，１９ａと、カムシャフト１５と平行な軸線を有するようにして両ウエブ１９ａ…の基端部外面に直角に連なる軸部１９ｂ，１９ｂと、両ウエブ１９ａ…の先端部間を結ぶ連結部１９ｃ…とを有して一体のクランク形状に構成され、前記軸部１９ｂ…は、前記カムホルダ２５…に設けられた支持孔３２…に回動可能に嵌合される。すなわちコントロールアーム１９はカムホルダ２５…で回動可能に支承される。   The control arm 19 has webs 19a, 19a disposed on both sides of the intake valves 12 and shaft portions that are perpendicular to the outer surfaces of the base ends of the webs 19a so as to have an axis parallel to the camshaft 15. 19b, 19b, and connecting portions 19c connecting the tip portions of the webs 19a, are formed into an integral crank shape, and the shaft portions 19b are provided with support holes 32 provided in the cam holder 25. ... is pivotably fitted to. That is, the control arm 19 is rotatably supported by the cam holders 25.

前記カムシャフト１５と平行な軸線を有する可動支軸１６は、コントロールアーム１９における両ウエブ１９ａ…の内側に配置される両サブカム１７…と、両サブカム１７…間に介装される円筒状のスペーサ３３とを貫通するものであり、該可動支軸１６の両端が前記両ウエブａ…の内側面に当接され、両ウエブ１９ａ…にそれぞれ挿通されるボルト３４，３４が可動支軸１６の両端部に螺合され、可動支軸１６および両サブカム１７…間にニードルベアリング３５，３５がそれぞれ介装される。   The movable support shaft 16 having an axis parallel to the camshaft 15 has a cylindrical spacer interposed between the subcams 17 disposed inside the webs 19a of the control arm 19 and the subcams 17. 33, both ends of the movable support shaft 16 are in contact with the inner surfaces of the two webs a, and bolts 34 and 34 respectively inserted into the two webs 19a are provided at both ends of the movable support shaft 16. The needle bearings 35 and 35 are interposed between the movable support shaft 16 and the sub-cams 17.

すなわちコントロールアーム１９の両ウエブ１９ａ…に両端が着脱可能に取付けられる可動支軸１６で両サブカム１７…が回動可能に支承されることになり、しかも可動支軸１６とは別体であるスペーサ３３が、両サブカム１７，１７間に介在するようにして可動支軸１６の外周に嵌装される。   That is, both the sub cams 17 are rotatably supported by the movable support shaft 16 that is detachably attached to both webs 19a of the control arm 19, and the spacer is separate from the movable support shaft 16. 33 is fitted on the outer periphery of the movable support shaft 16 so as to be interposed between the sub-cams 17 and 17.

しかもコントロールアーム１９の軸部１９ｂ…および前記可動支軸１６間に対応する位置で両サブカム１７…には、カムシャフト１５側に延びる一対ずつの支持腕部１７ａ，１７ａ…が略Ｕ字状にしてそれぞれ一体に設けられており、両支持腕部１７ａ、１７ａ…の先端間に固定される支軸３６…にニードルベアリング３８…を介して第２ローラ３７…が軸支され、それらの第２ローラ３７…は、カムシャフト１５の動弁カム１４…にそれぞれ転がり接触する。すなわちサブカム１７，１７はカムシャフト１５の動弁カムに第２ローラ３７…が接触することで可動支軸１６の軸線まわりに回動駆動される。   In addition, a pair of support arm portions 17a, 17a,... Extending in the camshaft 15 side are substantially U-shaped on the sub-cams 17 at positions corresponding to the shaft portion 19b of the control arm 19 and the movable support shaft 16. The second rollers 37 are pivotally supported via the needle bearings 38 on the support shafts 36 fixed between the tips of the support arm portions 17a, 17a, respectively. The rollers 37 are in rolling contact with the valve cams 14 of the camshaft 15, respectively. That is, the sub cams 17 and 17 are rotationally driven around the axis of the movable support shaft 16 when the second rollers 37.

また前記可動支軸１６に関して前記第２ローラ３７…とは反対側で前記両サブカム１７，１７には、受圧腕部１７ｂ，１７ｂがそれぞれ一体に設けられており、それらの受圧腕部１７ｂ…には、前記第２ローラ３７…を動弁カム１４…に転がり接触せしめる側にサブカム１７…をそれぞれ付勢するばね力が作用する。   Further, on the opposite side of the movable support shaft 16 from the second rollers 37, the sub cams 17, 17 are integrally provided with pressure receiving arm portions 17b, 17b, respectively. The spring force for urging the sub cams 17 acts on the side where the second rollers 37 are brought into contact with the valve cams 14.

すなわちコントロールアーム１９の連結部１９ｃには、サブカム１７…とは反対側の端部に端壁３９ａ…を有してサブカム１７…と反対側に延びる有底円筒状のガイド筒３９，３９が各サブカム１７…に個別に対応して一体に設けられており、前記サブカム１７…の受圧腕部１７ｂ…に当接する当接駒４２…およびガイド筒３９…の端壁３９…間にばね４３…が縮設される。   In other words, the connecting portion 19c of the control arm 19 has bottomed cylindrical guide tubes 39, 39 each having an end wall 39a at the end opposite to the sub cam 17 and extending to the opposite side of the sub cam 17. A spring 43 is provided between the contact piece 42 that contacts the pressure receiving arm portion 17b of the sub cam 17 and the end wall 39 of the guide tube 39. It is reduced.

ところで、サブカム１７…の下面には、カムフォロワ１８…の第１ローラ３１…を転がり接触せしめる当接面４５…が設けられるものであり、この当接面４５は、カムフォロワ１８を回動駆動するリフト部４５ａと、カムフォロワ１８を静止状態に保持すべく可動支軸１６の軸線からの距離を等距離としたベース円部４５ｂとが連なって成るものであり、リフト部４５ａは、動弁カム１４の回動に伴ってサブカム１７が回動する際にカムフォロワ１８の第２ローラ３７への接触点および可動支軸１６の軸線間の距離が次第に大きくなるようにして直線状に延びるように形成される。   By the way, the lower surface of the sub cam 17 is provided with a contact surface 45 for rolling and contacting the first rollers 31 of the cam follower 18. The contact surface 45 is a lift for driving the cam follower 18 to rotate. The portion 45a and a base circle portion 45b having the same distance from the axis of the movable support shaft 16 to keep the cam follower 18 in a stationary state are connected to each other. When the sub cam 17 rotates in accordance with the rotation, the distance between the contact point of the cam follower 18 with the second roller 37 and the axis of the movable support shaft 16 is gradually increased so as to extend linearly. .

しかもサブカム１７…の上面には、前記両支持腕部１７ａ，１７ａ…間で上方および側方に開いたオイル溜まり４６…が、動弁装置１３Ａを収納する動弁室内で飛散しているオイルを受けるようにして設けられており、このオイル溜まり４６…に溜まったオイルを、前記当接面４５…のベース円部４５ｂ…に導く潤滑油孔４７…がサブカム１７…に設けられる。   Moreover, an oil sump 46 opened upward and laterally between the support arm portions 17a, 17a ... on the upper surface of the sub cam 17 ... is scattered oil in the valve operating chamber that houses the valve operating device 13A. Lubricating oil holes 47 for guiding the oil accumulated in the oil reservoirs 46 to the base circular portions 45b of the contact surfaces 45 are provided in the sub cams 17.

コントロールアーム１９の前記連結部１９ｃにおいて、前記両ガイド筒３９…間の中間部には、上方に延びる一対の腕部１９ｄ，１９ｄが一体に設けられており、それらの腕部１９ｄ…の先端間に設けられる支軸４８にニードルベアリング４９を介して第３ローラ５０が軸支される。而して支軸４８の一端部には一方の腕部１９ｄの外面に当接係合する鍔部４８ａが設けられ、他方の腕部１９ｄから突出した支軸４８の他端部には、他方の腕部１９ｄの外面に当接、係合する止め輪５１が装着される。   In the connecting portion 19c of the control arm 19, a pair of upwardly extending arm portions 19d, 19d are integrally provided at an intermediate portion between the guide cylinders 39, and between the tips of the arm portions 19d. The third roller 50 is pivotally supported by a support shaft 48 provided on the shaft via a needle bearing 49. Thus, one end portion of the support shaft 48 is provided with a flange portion 48a that contacts and engages the outer surface of one arm portion 19d, and the other end portion of the support shaft 48 protruding from the other arm portion 19d has the other end portion. A retaining ring 51 that contacts and engages the outer surface of the arm portion 19d is mounted.

駆動手段２０は、前記第３ローラ５０を挟む挟み部５２ｃを有する駆動軸５２が電動モータ５３に連動、連結されて成るものであり、駆動軸５２は、カムホルダ２５…およびキャップ２６…間で回動自在に支承される一対の軸部５２ａ，５２ａと、それらの軸部５２ａ…の偏心位置間を結ぶ連結部５２ｂと、略Ｃ字状をなすように形成されて前記連結部５２ｂの中央部に設けられる前記挟み部５２ｃとを一体に有するものである。   The drive means 20 is configured such that a drive shaft 52 having a sandwiching portion 52c sandwiching the third roller 50 is interlocked and connected to an electric motor 53, and the drive shaft 52 rotates between the cam holder 25 and the cap 26. A pair of shaft portions 52a, 52a that are movably supported, a connecting portion 52b that connects the eccentric positions of the shaft portions 52a, and a central portion of the connecting portion 52b. And the sandwiching portion 52c provided in the body.

而して駆動手段２０によって第３ローラ５０が図３で示す位置に配置されるときには、可動支軸１６の軸線まわりに回動するサブカム１７…の当接面４５…のリフト部４５ａ…のうちベース円部４５ｎ…とは反対側の端部で吸気弁１２…におけるステム１２ａ…の上端が開弁方向に駆動されるものであり、この状態で吸気弁１２…のリフト量ｈが最大となる。また駆動手段２０によって第３ローラ５０が図９で示すように上方に回動されたときには、たとえばサブカム１７…の当接面４５…のベース円部４５ｂ…に吸気弁１２…におけるステム１２ａ…の上端が当接するものであり、この状態では吸気弁１２…のリフト量ｈが最小（＝０）となる。   Thus, when the third roller 50 is arranged at the position shown in FIG. 3 by the drive means 20, among the lift portions 45a of the contact surfaces 45 of the sub cams 17 that rotate around the axis of the movable support shaft 16. The upper end of the stem 12a in the intake valve 12 is driven in the valve opening direction at the end opposite to the base circle 45n, and the lift amount h of the intake valve 12 is maximized in this state. . When the third roller 50 is rotated upward as shown in FIG. 9 by the drive means 20, for example, the base circle 45b of the abutment surface 45 of the sub cam 17 is connected to the stem 12a of the intake valve 12. In this state, the lift amount h of the intake valves 12 is minimum (= 0).

ところでコントロールアーム１９の軸部１９ａ…の潤滑を果たすために、支持孔３２…の内面および軸部１９ｂ…の外面には相互に対応した環状凹部５４…，５５…が設けられており、支持孔３２…の内面の環状凹部５４…に通じるオイル通路５６…がカムホルダ２５…に設けられる。また駆動軸５２の軸部５２ａ…を支持する部分でカムホルダ２５…およびキャップ２６…の内周には、前記オイル通路５６…に通じる環状凹部５７…が設けられる。しかも駆動軸５２の軸部５２ａ…および連結部５２ｂには、一直線状に延びるオイル通路５８が設けられており、このオイル通路５８を前記環状凹部５７…に連通させる連通孔５９…が駆動軸５２の軸部５２ａ…に設けられ、前記オイル通路５８内のオイルを第３ローラ５０側に向けて噴出する噴出孔６０が連結部５２ｂの長手方向中央部に穿設される。而して噴出孔６０から噴出されるオイルは、第３ローラ５０および挟み部５２ｃ間の潤滑に供されるだけでなく、第３ローラ５０に当たって飛散することで前記サブカム１７…のオイル溜まり４７…に溜められる。   In order to achieve lubrication of the shaft portions 19a of the control arm 19, annular recesses 54, 55,... Corresponding to each other are provided on the inner surface of the support holes 32 and the outer surface of the shaft portions 19b. Oil passages 56 leading to the annular recesses 54 on the inner surface 32 are provided in the cam holder 25. Further, annular recesses 57 that communicate with the oil passages 56 are provided on the inner circumferences of the cam holders 25 and the caps 26 at the portions that support the shaft portions 52a of the drive shaft 52. Moreover, the shaft portion 52a of the drive shaft 52 and the connecting portion 52b are provided with an oil passage 58 extending in a straight line, and a communication hole 59 for communicating the oil passage 58 with the annular recess 57 is provided on the drive shaft 52. Are provided in the shaft portion 52a, and a jet hole 60 for jetting the oil in the oil passage 58 toward the third roller 50 is formed in the central portion in the longitudinal direction of the connecting portion 52b. Thus, the oil ejected from the ejection hole 60 is not only used for lubrication between the third roller 50 and the sandwiching portion 52c, but also hits the third roller 50 and scatters, so that the oil reservoirs 47 of the sub cams 17. Can be stored.

次にこの第１実施例の作用について説明すると、オイルを貯留するようにして上方および側方に開放したオイル溜まり４６…がサブカム１７…の上面に設けられ、カムフォロワ１８…を回動駆動するリフト部４５ａ…ならびにカムフォロワ１８…を静止状態に保持すべく可動支軸１６の軸線からの距離を等距離としたベース円部４５ｂ…とが連なって成る当接面４５…がカムフォロワ１８…の第１ローラ３１…に当接するようにしてサブカム１７…に設けられ、しかもオイル溜まり４６…のオイルを前記ベース円部４５ｂ…に導く潤滑油孔４７…がサブカム１７…に設けられている。   Next, the operation of the first embodiment will be described. An oil sump 46 opened upward and laterally so as to store oil is provided on the upper surface of the sub cams 17 and lifts for rotationally driving the cam followers 18. The first contact of the cam follower 18 is a contact surface 45 formed by a base circle 45b that is equidistant from the axis of the movable support shaft 16 so as to keep the portions 45a and the cam follower 18 stationary. Lubricating oil holes 47 are provided in the sub cams 17 so as to contact the rollers 31 and lead the oil in the oil reservoirs 46 to the base circular portions 45b.

したがってカムフォロワ１８…の第１ローラ３１…に当接すべくサブカム１７…に設けられた当接面４５…に、サブカム１７…の上面のオイル溜まり４６…から潤滑油孔４７…を介してオイルを供給するようにした簡単な潤滑構造で、サブカム１７…およびカムフォロワ１８…の接触部の潤滑を行うことができる。   Accordingly, the oil is supplied from the oil reservoir 46 on the upper surface of the sub cam 17 to the contact surface 45 provided on the sub cam 17 to contact the first roller 31 of the cam follower 18 through the lubricating oil hole 47. The contact portions of the sub cams 17 and the cam followers 18 can be lubricated with a simple lubrication structure to be supplied.

しかも潤滑油孔４７…は、当接面４５…のうち大きな荷重がかかることのないベース円部４５ｂ…に開口するものであるので、潤滑油孔４７…が設けられることによるサブカム１７…の剛性低下を心配する必要はない。   Moreover, since the lubricating oil holes 47 open into the base circular portions 45b of the abutment surface 45 where a large load is not applied, the rigidity of the sub cam 17 due to the provision of the lubricating oil holes 47. There is no need to worry about the decline.

またサブカム１７，１７を揺動可能に支承する可動支軸１６が、コントロールアーム１９に着脱可能に取付けられるので、カムフォロワ１８等の他の構成要素を取り外すことなくサブカム１７…の着脱操作を行うことができ、部品の交換作業が容易となる。しかも可動支軸１６がコントロールアーム１９に対して着脱可能とされることにより、可動支軸１６の内部に潤滑油通路を形成することが困難となるのであるが、サブカム１７…に設けられるオイル溜まり４６…から潤滑油孔４７…を介してサブカム１７…およびカムフォロワ１８…の接触部の潤滑を容易に行うことができる。   Further, since the movable support shaft 16 that supports the sub cams 17 and 17 so as to be swingable is detachably attached to the control arm 19, the sub cams 17 can be attached and detached without removing other components such as the cam follower 18. This makes it easy to replace parts. Moreover, since the movable support shaft 16 can be attached to and detached from the control arm 19, it becomes difficult to form a lubricating oil passage inside the movable support shaft 16. However, an oil reservoir provided in the sub cams 17. The contact portions of the sub cams 17 and the cam followers 18 can be easily lubricated through the lubricating oil holes 47 from 46.

さらに一対のサブカム１７，１７を揺動可能に支承する可動支軸１６の外周に、可動支軸１６とは別体であるスペーサ３３が、両サブカム１７，１７間に介在するようにして嵌装されるので、可動支軸１６の形状を単純化しつつ可動支軸１６の軸線に沿う方向での各サブカム１７…の位置を規制することができる。   Further, a spacer 33, which is separate from the movable support shaft 16, is fitted on the outer periphery of the movable support shaft 16 that supports the pair of sub cams 17, 17 so as to be swingable. Therefore, the position of each sub cam 17 in the direction along the axis of the movable support shaft 16 can be regulated while simplifying the shape of the movable support shaft 16.

図７〜図１０は本発明の第２実施例を示すものであり、上記第１実施例に対応する部分には同一の参照符号を付して図示するのみとし、詳細な説明は省略する。   7 to 10 show a second embodiment of the present invention. The parts corresponding to the first embodiment are indicated by the same reference numerals, and the detailed description is omitted.

両吸気弁１２…を開閉駆動する動弁装置１３Ｂは、一対の吸気弁１２…に個別に対応した動弁カム１４…が設けられるカムシャフト１５と、動弁カム１４…の回転軸線に直交する平面内で変位可能な可動支軸１６で揺動可能に支承されるとともに各動弁カム１４…に従動して揺動する一対のサブカム１７…と、各吸気弁１２…にそれぞれ個別に連動、連結されるとともに前記両サブカム１７…にそれぞれ従動する一対のカムフォロワ１８…と、可動支軸１６に連結されるともに前記カムシャフト１５の軸線と平行な軸線まわらいに回動可能なコントロールアーム１９′と、該コントロールアーム１９′を回動駆動する駆動手段２０′とを備える。   The valve operating device 13B that opens and closes the intake valves 12 is orthogonal to the rotational axis of the camshaft 15 provided with the valve cams 14 individually corresponding to the pair of intake valves 12 and the valve cams 14. A pair of sub-cams 17 that are supported by a movable support shaft 16 that is displaceable in a plane so as to be able to swing and that are driven by each valve cam 14. A pair of cam followers 18 that are connected and driven by the sub-cams 17 respectively, and a control arm 19 ′ that is connected to the movable support shaft 16 and is rotatable about an axis parallel to the axis of the camshaft 15. And drive means 20 'for rotationally driving the control arm 19'.

サブカム１７…の下面には、カムフォロワ１８…を回動駆動するリフト部４５ａ…と、カムフォロワ１８…を静止状態に保持すべく可動支軸１６の軸線からの距離を等距離としたベース円部４５ｂ…とが連なって成る当接面４５…がカムフォロワ１８…の第１ローラ３１…を転がり接触せしめるべく設けられ、サブカム１７…の上面に設けられたオイル溜まりのオイル４６…を当接面４５…のベース円部４５ｂ…に導く潤滑油孔４７…がサブカム１７…に設けられる。   On the lower surface of the sub cam 17, there are a lift part 45 a that rotationally drives the cam followers 18, and a base circular part 45 b that is equidistant from the axis of the movable support shaft 16 so as to hold the cam followers 18 in a stationary state. A contact surface 45 is formed to be in contact with the first roller 31 of the cam follower 18 in a rolling manner, and an oil reservoir 46 provided on the upper surface of the sub cam 17 is connected to the contact surface 45. Lubricating oil holes 47 leading to the base circles 45b are provided in the sub cams 17.

コントロールアーム１９′は、前記両吸気弁１２…の両側に配置されるウエブ１９ａ…と、カムシャフト１５と平行な軸線を有するようにして両ウエブ１９ａ…の基端部外面に直角に連なる軸部１９ｂ…と、両ウエブ１９ａ…の先端部間を結ぶ連結部１９ｃ′とを有して一体のクランク形状に構成され、前記軸部１９ｂ…は、前記カムホルダ２５…に設けられた支持孔３２…に回動可能に嵌合される。すなわちコントロールアーム１９′はカムホルダ２５…で回動可能に支承される。   The control arm 19 ′ has webs 19 a arranged on both sides of the intake valves 12, and a shaft portion that is perpendicular to the outer surface of the base end portion of the webs 19 a so as to have an axis parallel to the camshaft 15. 19b ... and a connecting portion 19c 'connecting between the tip portions of the webs 19a ... are formed into an integral crank shape, and the shaft portions 19b ... are provided in support holes 32 provided in the cam holder 25 ... It is fitted to be rotatable. That is, the control arm 19 'is rotatably supported by the cam holders 25 ....

駆動手段２０′は、コントロールアーム１９′の前記連結部１９ｃ′において両ガイド筒３９…間の中間部に設けられるセクタギヤである被動ギヤ６１と、該被動ギヤ６１に噛合する駆動ギヤ６２と、該駆動ギヤ６２に連動、連結される電動モータ５３とで構成される。   The drive means 20 'includes a driven gear 61, which is a sector gear provided at an intermediate portion between the guide cylinders 39 in the connecting portion 19c' of the control arm 19 ', a drive gear 62 meshing with the driven gear 61, The electric motor 53 is linked to and connected to the drive gear 62.

駆動ギヤ６２は、カムホルダ２５…およびキャップ２６…間で回動自在に支承される回動軸６３に設けられるものであり、この回動軸６３が電動モータ５３に連動、連結される。しかも回動軸６３を支持する部分でカムホルダ２５…およびキャップ２６…の内周には、カムホルダ２５…のオイル通路５６…に通じる環状凹部６４…が設けられ、回動軸６３には、一直線状に延びるオイル通路６５が設けられるとともに該オイル通路６５を前記環状凹部６４…に連通させる連通孔６６…が設けられ、さらにオイル通路６５内のオイルを駆動ギヤ６２および被動ギヤ６１の噛合部に向けて噴出する噴出孔６７，６７が回動軸６３に設けられ、噴出孔６７，６７から噴出されるオイルは、駆動ギヤ６２および被動ギヤ６１の噛合部の潤滑に供されるだけでなく、飛散することで前記サブカム１７…のオイル溜まり４６…に溜められる。   The drive gear 62 is provided on a rotating shaft 63 that is rotatably supported between the cam holders 25 and the caps 26. The rotating shaft 63 is linked and connected to the electric motor 53. In addition, an annular recess 64 that communicates with the oil passage 56 of the cam holder 25 is provided on the inner periphery of the cam holder 25 and the cap 26 at a portion that supports the rotation shaft 63. And an oil passage 65 extending to the annular recess 64 is provided, and the oil in the oil passage 65 is directed toward the meshing portion of the drive gear 62 and the driven gear 61. The ejection holes 67, 67 that are ejected in this manner are provided in the rotating shaft 63, and the oil ejected from the ejection holes 67, 67 is not only used for lubrication of the meshing portions of the drive gear 62 and the driven gear 61 but also scattered As a result, the oil is stored in the oil reservoirs 46 of the sub cams 17.

而して駆動ギヤ６２が図９で示すように被動ギヤ６１のカムシャフト１５側の端部に噛合された状態では、可動支軸１６の軸線まわりに回動するサブカム１７…の当接面４５…のリフト部４５ａ…のうちベース円部４５ｂ…とは反対側の端部で吸気弁１２…におけるステム１２…の上端が開弁方向に駆動されるものであり、この状態で吸気弁１２…のリフト量ｈが最大となる。また駆動ギヤ６２が図１０で示すように被動ギヤ６１のカムシャフト１５とは反対側の端部に噛合された状態では、たとえばサブカム１７…の当接面４５…のベース円部４５ｂ…に吸気弁１２…におけるステム１２ａ…の上端が当接するものであり、この状態では吸気弁１２…のリフト量ｈが最小（＝０）となる。   Thus, when the drive gear 62 is engaged with the end of the driven gear 61 on the camshaft 15 side as shown in FIG. 9, the abutment surface 45 of the sub cam 17 that rotates about the axis of the movable support shaft 16. The upper end of the stem 12 in the intake valve 12 is driven in the valve opening direction at the end opposite to the base circle 45b in the lift part 45a ..., and in this state, the intake valve 12 ... The lift amount h is maximized. Further, when the drive gear 62 is engaged with the end of the driven gear 61 opposite to the camshaft 15 as shown in FIG. 10, for example, the intake air is sucked into the base circular portion 45b of the contact surface 45 of the sub cam 17. The upper ends of the stems 12a in the valves 12 are in contact with each other. In this state, the lift amount h of the intake valves 12 is minimum (= 0).

しかも前記噴出孔６７，６７は、駆動ギヤ６２が被動ギヤ６１のカムシャフト１５側の端部に噛合された状態、ならびに駆動ギヤ６２が被動ギヤ６１のカムシャフト１５とは反対側の端部に噛合された状態のいずれの状態にあっても、駆動ギヤ６２および被動ギヤ６１の噛合部にオイルを供給し得るようにして、回動軸６３の周方向に間隔をあけた２箇所に設けられる。   Moreover, the ejection holes 67 and 67 are formed in a state in which the drive gear 62 is engaged with the end portion of the driven gear 61 on the camshaft 15 side, and in the end portion of the driven gear 61 opposite to the camshaft 15. Regardless of the engaged state, the oil can be supplied to the engaging portion of the drive gear 62 and the driven gear 61 so as to be provided at two locations spaced in the circumferential direction of the rotating shaft 63. .

この第２実施例によっても上記第１実施例と同様の効果を奏することができる。   The same effects as those of the first embodiment can be obtained by the second embodiment.

以上、本発明の実施例を説明したが、本発明は上記実施例に限定されるものではなく、特許請求の範囲に記載された本発明を逸脱することなく種々の設計変更を行うことが可能である。   Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

第１実施例の内燃機関の要部縦断側面図である。It is a principal part vertical side view of the internal combustion engine of 1st Example. 図１の２−２線断面図である。FIG. 2 is a sectional view taken along line 2-2 of FIG. 高リフト状態での図２の３−３線断面図である。FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 2 in a high lift state. 動弁装置の要部斜視図である。It is a principal part perspective view of a valve gear. 動弁装置の要部分解斜視図である。It is a principal part disassembled perspective view of a valve gear. 低リフト状態での図３に対応した断面図である。It is sectional drawing corresponding to FIG. 3 in a low lift state. 第２実施例の図２に対応した断面図であって図９の７−７線に沿う断面図である。It is sectional drawing corresponding to FIG. 2 of 2nd Example, Comprising: It is sectional drawing which follows the 7-7 line | wire of FIG. コントロールアームの斜視図である。It is a perspective view of a control arm. 高リフト状態での図７の９−９線断面図である。FIG. 9 is a cross-sectional view taken along line 9-9 of FIG. 7 in a high lift state. 低リフト状態での図９に対応した断面図である。FIG. 10 is a cross-sectional view corresponding to FIG. 9 in a low lift state.

符号の説明Explanation of symbols

１２・・・機関弁である吸気弁
１３Ａ，１３Ｂ・・・動弁装置
１４・・・動弁カム
１６・・・可動支軸
１７・・・サブカム
１８・・・カムフォロワ
１９，１９′・・・コントロールアーム
２０，２０′・・・駆動手段
３３・・・スペーサ
４５・・・当接面
４５ａ・・・リフト部
４５ｂ・・・ベース円部
４６・・・オイル溜まり
４７・・・潤滑油孔 12 ... Intake valves 13A, 13B, which are engine valves ... Valve operating device 14 ... Valve operating cam 16 ... Movable support shaft 17 ... Sub cam 18 ... Cam follower 19, 19 '... Control arm 20, 20 '... driving means 33 ... spacer 45 ... contact surface 45a ... lift part 45b ... base circular part 46 ... oil reservoir 47 ... lubricating oil hole

Claims (3)

動弁カム（１４）の回転軸線に直交する平面内で変位可能な可動支軸（１６）で揺動可能に支承されるとともに前記動弁カム（１４）に従動して揺動するサブカム（１７）と、機関弁（１２）に連動、連結されるとともに前記サブカム（１７）に従動するカムフォロワ（１８）とを備え、前記可動支軸（１６）を変位させることで機関弁（１２）のリフト量を変化させるようにした内燃機関のリフト可変動弁装置において、前記可動支軸（１６）に連結されるとともに前記動弁カム（１４）の回転軸線と平行な軸線まわりに回動可能なコントロールアーム（１９，１９′）と、該コントロールアーム（１９，１９′）を回動駆動する駆動手段（２０，２０′）とを含み、オイルを貯留するようにして上方に開放したオイル溜まり（４６）が上面に設けられる前記サブカム（１７）に、前記カムフォロワ（１８）を回動駆動するリフト部（４５ａ）ならびに前記カムフォロワ（１８）を静止状態に保持すべく前記可動支軸（１６）の軸線からの距離を等距離としたベース円部（４５ｂ）とが連なって成る当接面（４５）が該当接面（４５）を前記カムフォロワ（１８）に当接させるようにして設けられるとともに、前記オイル溜まり（４６）のオイルを前記ベース円部（４５ｂ）に導く潤滑油孔（４７）が設けられることを特徴とする内燃機関のリフト可変動弁装置。   A sub cam (17) that is swingably supported by a movable support shaft (16) that is displaceable in a plane orthogonal to the rotational axis of the valve cam (14) and that swings in accordance with the valve cam (14). ) And a cam follower (18) linked to and coupled to the engine valve (12) and driven by the sub cam (17), and the movable support shaft (16) is displaced to lift the engine valve (12). In the variable lift valve operating system for an internal combustion engine, the amount of which is variable, the control is connected to the movable support shaft (16) and is rotatable about an axis parallel to the rotation axis of the valve operating cam (14). An oil sump (46) including an arm (19, 19 ') and drive means (20, 20') for rotationally driving the control arm (19, 19 ') and opened upward so as to store oil. ) Is on A distance from an axis of the movable support shaft (16) to hold the cam follower (18) in a stationary state and a lift portion (45a) for rotating the cam follower (18) to the sub cam (17) provided on the sub cam (17) A contact surface (45) that is connected to a base circle portion (45b) that is equidistant from each other is provided so that the corresponding contact surface (45) contacts the cam follower (18), and the oil reservoir ( 46. A variable lift valve operating system for an internal combustion engine, wherein a lubricating oil hole (47) is provided for guiding the oil of 46) to the base circle (45b). 前記サブカム（１７）を揺動可能に支承する前記可動支軸（１６）が、前記コントロールアーム（１９，１９′）に着脱可能に取付けられることを特徴とする請求項１記載の内燃機関のリフト可変動弁装置。   2. The lift of an internal combustion engine according to claim 1, wherein the movable support shaft (16) for swingably supporting the sub cam (17) is detachably attached to the control arm (19, 19 '). Variable valve gear. 複数の前記サブカム（１７）を揺動可能に支承する前記可動支軸（１６）の外周に、可動支軸（１６）とは別体であるスペーサ（３３）が、前記各サブカム（１７）間に介在するようにして嵌装されることを特徴とする請求項２記載の内燃機関のリフト可変動弁装置。   A spacer (33) separate from the movable support shaft (16) is provided between the sub cams (17) on the outer periphery of the movable support shaft (16) for pivotally supporting the plurality of sub cams (17). The lift variable valve operating apparatus for an internal combustion engine according to claim 2, wherein the lift variable valve operating apparatus for the internal combustion engine is fitted so as to be interposed therebetween.
JP2005132599A 2005-04-28 2005-04-28 Lift variable valve mechanism of internal combustion engine Pending JP2006307765A (en)

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JP2005132599A JP2006307765A (en) 2005-04-28 2005-04-28 Lift variable valve mechanism of internal combustion engine
US11/405,678 US7252058B2 (en) 2005-04-28 2006-04-18 Lift-variable valve-operating system for internal combustion engine
DE102006019062A DE102006019062A1 (en) 2005-04-28 2006-04-25 Stroke variable valve actuation system for an internal combustion engine
US11/822,917 US7387096B2 (en) 2005-04-28 2007-07-11 Lift-variable valve-operating systems for internal combustion engine

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JP2010096041A (en) * 2008-10-15 2010-04-30 Honda Motor Co Ltd Variable valve gear for internal combustion engine
JP2011052570A (en) * 2009-08-31 2011-03-17 Honda Motor Co Ltd Variable valve gear of internal combustion engine
US8307799B2 (en) 2009-11-05 2012-11-13 Hyundai Motor Company Lubrication system for fuel pump of GDI engine

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US20060249111A1 (en) 2006-11-09
US7387096B2 (en) 2008-06-17
DE102006019062A1 (en) 2006-11-09
US20070261650A1 (en) 2007-11-15
US7252058B2 (en) 2007-08-07

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